The slippery slope isn't a fallacy. It's a thought experiment. It's commonly used to explore the boundaries of an idea and to attempt to distinguish a course of action or policy from an extreme, absurd result. If the only defense of the course of action / policy is "trust me bro, that will never happen. You're committing the slippery slope fallacy" the experiment proves that the absurd will be the result. 🤷♂️